A dual-mode broadband base station antenna

Abstract

This application provides a dual-mode broadband base station antenna, including a dielectric substrate, a metal ground plane, a radiating patch, and two microstrip lines. The metal ground plane is disposed on one surface of the dielectric substrate, and the radiating patch and microstrip lines are disposed on the other surface of the dielectric substrate opposite to the metal ground plane. The radiating patch is etched with a slotted structure, including two U-shaped slots and one straight slot. The openings of the two U-shaped slots are opposite each other and symmetrically arranged with respect to the centerline of the radiating patch. The straight slot is perpendicular to the centerline of the radiating patch, and its two ends are respectively embedded in the openings of the two U-shaped slots. The two microstrip lines are symmetrically arranged on both sides of the radiating patch. The dual-mode broadband base station antenna provided by this application solves the problems of size and performance contradictions, insufficient bandwidth expansion capability, weak anti-interference capability, complex structure, and high cost in existing antenna technologies.

Description

Technical Field

[0001] This application relates to the field of wireless communication technology, and more specifically to a dual-mode broadband base station antenna. Background Technology

[0002] In modern mobile communication systems, base station antennas are core components for wireless signal transmission, and their performance directly affects communication quality, network coverage, and user connection stability. Microstrip patch antennas, with their advantages of low profile, light weight, ease of manufacture, and conformal integration with circuitry, have gained widespread application in modern base station communication systems.

[0003] Existing microstrip patch antenna technology primarily improves performance through structural optimization and material improvements. For example, traditional designs etch U-shaped or E-shaped slots on the radiating patch to extend the current path, thereby reducing the resonant frequency and achieving miniaturization; or they introduce parasitic patches or multilayer coupled feed structures to excite multiple resonant modes and expand the bandwidth. Furthermore, high-dielectric-constant substrates are used to reduce antenna size. To address interference immunity requirements, some solutions employ external filters or electromagnetic metamaterial structures.

[0004] However, existing microstrip patch antenna technology still faces challenges such as the contradiction between size and performance and insufficient bandwidth expansion capabilities. Summary of the Invention

[0005] This application provides a dual-mode broadband base station antenna to solve the technical problems of size and performance contradiction, insufficient bandwidth expansion capability, weak anti-interference capability, complex structure and high cost in existing microstrip patch antenna technology.

[0006] This application provides a dual-mode broadband base station antenna, including a dielectric substrate, a metal ground plane, a radiating patch, and two microstrip lines; the metal ground plane is disposed on one side surface of the dielectric substrate, and the radiating patch and the microstrip lines are disposed on the other side surface of the dielectric substrate opposite to the metal ground plane;

[0007] The radiating patch is etched with a grooved structure, which includes two U-shaped grooves and one straight groove. The openings of the two U-shaped grooves are opposite each other and symmetrically arranged with respect to the centerline of the radiating patch. The straight groove is perpendicular to the centerline of the radiating patch, and the two ends of the straight groove are respectively embedded in the openings of the two U-shaped grooves. The two microstrip lines are symmetrically arranged on both sides of the radiating patch.

[0008] This configuration allows the surface current to be layered and disturbed on the patch, extending the current flow distance and optimizing the uniformity of current distribution, thus providing a structural basis for miniaturization and broadband operation.

[0009] As an optional implementation, both microstrip lines are U-shaped, with the openings of the microstrip lines facing the radiating patch and having a gap between them, so that the microstrip lines and the radiating patch can form a dual-mode resonance through electromagnetic coupling.

[0010] This configuration, through the opening direction and gap design of the U-shaped microstrip line, optimizes the electromagnetic coupling strength, enabling more precise fusion of dual-mode resonant modes and improving the stability of broadband characteristics.

[0011] As an alternative implementation, the length of the microstrip line is approximately half the wavelength of the center frequency.

[0012] With this configuration, the microstrip stub interacts with the patch master mode through electromagnetic coupling, allowing the two to merge smoothly within the passband and broaden the impedance bandwidth to achieve dual-mode broadband characteristics.

[0013] As an optional implementation, the radiation from the microstrip line and the radiating patch cancels each other out in the far field, forming a radiation null point.

[0014] This configuration, through precise design, actively suppresses adjacent channel interference.

[0015] As an optional implementation, the dielectric substrate is square, the radiating patch is square, and the four edges of the radiating patch are parallel to the four edges of the dielectric substrate; the middle section of the microstrip line is parallel to one side edge of the radiating patch, and both ends of the microstrip line extend toward the radiating patch and are at least partially opposite to the two sides adjacent to the one side edge of the radiating patch.

[0016] This configuration enhances coupling strength, improves dual-mode excitation efficiency, optimizes current distribution symmetry, maximizes space utilization, enables miniaturization and high-density array integration, and simplifies manufacturing processes.

[0017] As an optional implementation, the depth direction of the U-shaped groove is consistent with the extension direction of the straight groove, and the extension direction of the straight groove is perpendicular to the middle section of the microstrip line.

[0018] This configuration extends the surface current path and enhances the ability to control the resonant frequency, optimizes the electromagnetic coupling region distribution between the radiating patch and the microstrip stub, avoids field strength interference, and improves the smoothness of dual-mode fusion.

[0019] As an optional implementation, the depth of the U-shaped groove is greater than or equal to the width of the U-shaped groove.

[0020] This configuration improves miniaturization and enhances input impedance matching characteristics.

[0021] As an optional implementation, the relationship between the width and depth of the U-shaped groove can be flexibly set according to design requirements.

[0022] This configuration improves input impedance matching characteristics, optimizes the disturbance of surface current paths, and ensures that the slot structure maintains sufficient radiation efficiency while achieving miniaturization.

[0023] As an optional implementation, the dual-mode broadband base station antenna also includes a coaxial feed probe, which is disposed on the side of the slotted structure and located on the centerline of the radiating patch. The coaxial feed probe is used to excite the radiating patch.

[0024] This setting optimizes input matching and improves radiation efficiency.

[0025] As an alternative implementation, all components of the dual-mode broadband base station antenna are integrated using a single-sided etching process.

[0026] This design simplifies the manufacturing process, enhances the long-term stability and environmental adaptability of the antenna, and provides an economical and efficient solution for the large-scale deployment of base station antennas.

[0027] This application provides a dual-mode broadband base station antenna, including a dielectric substrate, a metal ground plane, a radiating patch, and two microstrip lines. The metal ground plane is disposed on one surface of the dielectric substrate, and the radiating patch and the microstrip lines are disposed on the other surface of the dielectric substrate opposite to the metal ground plane. The radiating patch is etched with a slotted structure, which includes two U-shaped slots and one straight slot. The openings of the two U-shaped slots are opposite each other and symmetrically arranged with respect to the centerline of the radiating patch. The straight slot is perpendicular to the centerline of the radiating patch, and its two ends are respectively embedded in the openings of the two U-shaped slots. The two microstrip lines are symmetrically arranged on both sides of the radiating patch. This solves the problems of size and performance contradictions, insufficient bandwidth expansion capability, weak anti-interference capability, complex structure, and high cost in existing antenna technologies. Attached Figure Description

[0028] The accompanying drawings, which are provided to further illustrate this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application.

[0029] Figure 1 This is a three-dimensional structural schematic diagram of a dual-mode broadband base station antenna according to an embodiment of this application;

[0030] Figure 2 This is a top view and a schematic diagram of structural parameters of a dual-mode broadband base station antenna according to an embodiment of this application;

[0031] Figure 3 This is a reflection coefficient diagram of a dual-mode broadband base station antenna according to an embodiment of this application;

[0032] Figure 4 This is a radiation gain diagram of a dual-mode broadband base station antenna according to an embodiment of this application;

[0033] Figure 5 This is a radiation pattern of a dual-mode broadband base station antenna at the center frequency according to an embodiment of this application.

[0034] The components in the attached diagram are labeled as follows:

[0035] 1. Dielectric substrate; 2. Radiation patch; 3-1. First microstrip line; 3-2. Second microstrip line; 4. Metal ground plane; 5-1. First U-shaped groove; 5-2. Second U-shaped groove; 6. Linear groove; 7. Coaxial feed probe. Detailed Implementation

[0036] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] It should be noted that if the embodiments of this application involve descriptions such as "first" and "second," such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" and "second" may explicitly or implicitly include at least one of those features.

[0038] First, let me explain the terms used in this application:

[0039] Dielectric substrate: refers to the insulating material layer used to support the metal structure of the antenna, such as FR-4 or PTFE composite material. Its upper and lower surfaces are used to etch radiating patches and ground planes, respectively.

[0040] Radiation patch: refers to the metal patch in an antenna used to transmit and receive electromagnetic waves, usually in the form of a rectangle, circle or irregular shape.

[0041] Composite slotted structure: refers to a combination of multiple slotted structures etched on a radiating patch, such as U-shaped slots and straight slots, used to disturb the surface current path and regulate the resonance characteristics.

[0042] Microstrip stubs: These are metal strip structures coupled to radiating patches, such as U-shaped stubs or inverted U-shaped stubs, used to excite additional resonant modes and broaden bandwidth.

[0043] Coaxial probe feeding structure: refers to a structure that feeds electromagnetic signals into a radiating patch through a coaxial feeding probe. The location and size of the feeding point are used to optimize impedance matching.

[0044] Center frequency wavelength: refers to the wavelength of electromagnetic waves corresponding to the center frequency of the sky band. For example, the wavelength corresponding to 2.4 GHz is approximately 125 mm.

[0045] In modern mobile communication systems, base station antennas, as a core component for wireless signal transmission, directly affect communication quality, network coverage, and user connection stability. Microstrip patch antennas, with their advantages of low profile, light weight, ease of manufacture, and conformal integration with circuitry, have gained widespread application in modern base station communication systems.

[0046] Existing microstrip patch antenna technology primarily improves performance through structural optimization and material improvements. For example, traditional designs etch U-shaped or E-shaped slots on the radiating patch to extend the current path, thereby reducing the resonant frequency and achieving miniaturization; or they introduce parasitic patches or multilayer coupled feed structures to excite multiple resonant modes and expand the bandwidth. Furthermore, high-dielectric-constant substrates are used to reduce antenna size. To address interference immunity requirements, some solutions employ external filters or electromagnetic metamaterial structures.

[0047] However, existing microstrip patch antenna technology still faces challenges such as the contradiction between size and performance, insufficient bandwidth expansion capability, weak anti-interference capability, complex structure and high cost.

[0048] To address the aforementioned issues, this embodiment provides a dual-mode broadband base station antenna. The core technology integrates a composite slotted structure and symmetrical microstrip lines on a single-layer dielectric substrate, achieving synergistic optimization of antenna miniaturization, broadband performance, and high-frequency out-of-band interference suppression. Specifically, the inventors propose a composite slotting technology of "symmetrical double U-shaped slots + embedded straight slots." This technology reduces the resonant frequency by perturbing the surface current path of the radiating patch, while simultaneously leveraging the coupling effect of the symmetrical U-shaped microstrip lines to excite and fuse multiple resonant modes, thus broadening the bandwidth. Furthermore, the far-field radiation cancellation effect of the radiating patch and microstrip lines actively introduces high-frequency out-of-band radiation nulls, thereby improving frequency selectivity. This concept overcomes the inherent contradiction between size, bandwidth, and anti-interference capability in traditional microstrip antennas, achieving a balance between structural simplicity and performance breakthroughs. It addresses the technical problems of size-performance contradictions, insufficient bandwidth expansion capability, weak anti-interference capability, complex structure, and high cost in existing microstrip patch antenna technology.

[0049] Figure 1This is a three-dimensional structural schematic diagram of a dual-mode broadband base station antenna according to an embodiment of this application;

[0050] Figure 2 This is a top view and structural parameter diagram of a dual-mode broadband base station antenna according to an embodiment of this application.

[0051] See Figure 1 and Figure 2 As shown, this application provides a dual-mode broadband base station antenna, including a dielectric substrate 1, a metal ground plane 4, a radiating patch 2, and two first microstrip lines 3-1 and a second microstrip line 3-2; the metal ground plane 4 is disposed on one side surface of the dielectric substrate 1, and the radiating patch 2 and the first microstrip line 3-1 and the second microstrip line 3-2 are disposed on the other side surface of the dielectric substrate opposite to the metal ground plane.

[0052] The radiating patch 2 is etched with a grooved structure, which includes a first U-shaped groove 5-1, a second U-shaped groove 5-2, and a straight groove 6. The openings of the first U-shaped groove 5-1 and the second U-shaped groove 5-2 are opposite to each other and symmetrically arranged with respect to the centerline of the radiating patch. The straight groove 6 is perpendicular to the centerline of the radiating patch 2, and the two ends of the straight groove 6 are respectively embedded in the openings of the first U-shaped groove 5-1 and the second U-shaped groove 5-2. The first microstrip line 3-1 and the second microstrip line 3-2 are symmetrically arranged on both sides of the radiating patch.

[0053] It should be noted that the composite slotted structure, through the nested arrangement of the first U-shaped slot 5-1, the second U-shaped slot 5-2, and the straight slot 6, causes the surface current to be disturbed in layers on the patch, extending the current flow distance. The first U-shaped slot 5-1 and the second U-shaped slot 5-2 are symmetrically arranged along the centerline with their openings facing each other, forming the main disturbance path; the straight slot 6 is embedded between the openings of the first U-shaped slot 5-1 and the second U-shaped slot 5-2, further disturbing the current path. This nested structure, through multi-level disturbance effects, gradually reduces the resonant frequency while optimizing the uniformity of the current distribution, providing a structural basis for miniaturization and broadband operation.

[0054] As an optional implementation, both the first microstrip line 3-1 and the second microstrip line 3-2 are U-shaped structures. The openings of the first microstrip line 3-1 and the second microstrip line 3-2 face the radiating patch 2 and have gaps between them, so that the first microstrip line 3-1, the second microstrip line 3-2 and the radiating patch 2 can form a dual-mode resonance through electromagnetic coupling.

[0055] It should be noted that the openings of the U-shaped first microstrip line 3-1 and the second microstrip line 3-2 face the radiating patch 2 and maintain electromagnetic coupling through a gap, merging with the main mode of the radiating patch 2 to form a dual-mode broadband characteristic. The symmetrical microstrip stubs on the U-shaped first microstrip line 3-1 and the second microstrip line 3-2 excite additional resonant modes through electromagnetic coupling, smoothly merging with the main mode of the radiating patch 2 within the passband, broadening the impedance bandwidth and increasing stability. Furthermore, without the need for multilayer structures or special materials, all functional units are integrated through a single PCB etching process, significantly reducing manufacturing costs and improving production consistency.

[0056] As an alternative implementation, the lengths of the first microstrip line 3-1 and the second microstrip line 3-2 are approximately half the wavelength of the center frequency.

[0057] It is understandable that the lengths of the first microstrip line 3-1 and the second microstrip line 3-2 are designed to be approximately half the wavelength of the center frequency, so that the first microstrip line 3-1 and the second microstrip line 3-2 resonate within the operating frequency band and couple with the main resonant mode of the radiating patch 2.

[0058] It should be noted that the lengths of the first microstrip line 3-1 and the second microstrip line 3-2 are designed to be approximately half the wavelength of the center frequency, making the frequency of the additional resonant mode slightly higher than the main mode of the radiating patch 2. The microstrip stubs of the first microstrip line 3-1 and the second microstrip line 3-2 interact with the main mode of the patch through electromagnetic coupling, allowing them to smoothly merge within the passband and broaden the impedance bandwidth. Adjusting the stub length achieves dual-mode broadband characteristics by matching the frequency distribution of the additional resonant mode and the main mode.

[0059] Figure 3 This is a reflection coefficient diagram of a dual-mode broadband base station antenna according to an embodiment of this application;

[0060] Figure 4 This is a radiation gain diagram of a dual-mode broadband base station antenna according to an embodiment of this application;

[0061] As an optional implementation, the radiation from the first microstrip line 3-1, the second microstrip line 3-2, and the radiating patch 2 cancel each other out in the far field, forming a radiation null point.

[0062] It should be noted that the microstrip stubs of the first microstrip line 3-1 and the second microstrip line 3-2 and the far-field radiation cancellation effect of the radiating patch 2 are generated outside the high-frequency band by precisely designing their size and position, thereby actively suppressing adjacent-channel interference.

[0063] For example, see Figure 3 and Figure 4 In one alternative implementation, the antenna generates a radiation null point outside the high-frequency band (2.49 GHz), effectively suppressing out-of-band interference.

[0064] As an optional implementation, the dielectric substrate 1 is square, the radiating patch 2 is square, and the four edges of the radiating patch 2 are parallel to the four edges of the dielectric substrate 1, respectively; the middle sections of the first microstrip line 3-1 and the second microstrip line 3-2 are parallel to one side edge of the radiating patch 2, and the two ends of the first microstrip line 3-1 and the second microstrip line 3-2 extend toward the radiating patch 2, and are at least partially opposite to the two sides adjacent to one side edge of the radiating patch.

[0065] It should be noted that the U-shaped three-sided encirclement layout of the first microstrip line 3-1 and the second microstrip line 3-2 enhances the coupling strength, improves the dual-mode excitation efficiency, and optimizes the symmetry of the current distribution, ensuring a stable radiation pattern and avoiding beam tilt or sidelobe increase.

[0066] Understandably, the compact and symmetrical design not only maximizes space utilization and enables miniaturization and high-density array integration, but also simplifies the manufacturing process, improves production consistency and yield, and is suitable for high-volume, low-cost production.

[0067] As an optional implementation, the groove depth direction of the first U-shaped groove 5-1 and the second U-shaped groove 5-2 is consistent with the extension direction of the straight groove 6, and the extension direction of the straight groove 6 is perpendicular to the middle section of the first microstrip line 3-1 and the second microstrip line 3-2.

[0068] It should be noted that by aligning the first U-shaped groove 5-1 and the second U-shaped groove 5-2 with the straight groove 6 in the direction of current disturbance, the surface current path is effectively extended and the ability to control the resonant frequency is enhanced. At the same time, the extension direction of the straight groove 6 is perpendicular to the middle section of the first microstrip line 3-1 and the second microstrip line 3-2, which optimizes the distribution of the electromagnetic coupling region between the radiating patch 2 and the microstrip stub, avoids field strength interference, and improves the smoothness of dual-mode fusion.

[0069] As an optional implementation, the groove depth of the first U-shaped groove 5-1 and the second U-shaped groove 5-2 is greater than, less than or equal to the groove width of the first U-shaped groove 5-1 and the second U-shaped groove 5-2.

[0070] It should be noted that the depth of the first U-shaped groove 5-1 and the second U-shaped groove 5-2 is greater than, less than or equal to the groove width. By increasing the spacing or longitudinal depth between the first U-shaped groove 5-1 and the second U-shaped groove 5-2, the surface current path is further disturbed, the disturbance depth on the surface current path is enhanced, and the equivalent electrical length is extended. This allows for a more efficient reduction of the resonant frequency within the limited area of ​​the radiating patch 2, thereby improving the miniaturization effect. At the same time, the deeper groove structure helps to optimize the uniformity of current distribution, improve the input impedance matching characteristics, and avoid bandwidth contraction or efficiency reduction caused by local current concentration.

[0071] As an optional implementation, the ratio of the width of the first U-shaped groove 5-1 to the depth of the U-shaped groove 5-2 can be flexibly set according to design requirements.

[0072] It should be noted that by adjusting the ratio of the width to the depth of the first U-shaped slot 5-1 and the second U-shaped slot 5-2, the surface current distribution of the radiating patch 2 is made more uniform. A wider slot width reduces surface resistance, while a deeper slot depth or a larger slot spacing enhances current path disturbance. The two work together to further improve the input impedance matching characteristics, avoid bandwidth contraction caused by uneven current distribution, and ensure stable radiation efficiency of the antenna in a wide frequency band.

[0073] Understandably, by adjusting the width, depth, and spacing of the first U-shaped groove 5-1 and the second U-shaped groove 5-2, the disturbance level of the surface current path can be further optimized, so that the equivalent current length can reduce the resonant frequency while avoiding excessive loss. This ratio range ensures that the groove structure maintains sufficient radiation efficiency while achieving miniaturization.

[0074] As an optional implementation, the dual-mode broadband base station antenna also includes a coaxial feed probe 7, which is disposed on the side of the slotted structure and located on the centerline of the radiating patch 2. The coaxial feed probe is used to excite the radiating patch 2.

[0075] It is understandable that placing the coaxial feed probe 7 on the centerline of the radiating patch ensures a symmetrical distribution of the master mode current, avoids impedance abrupt changes or field strength distortion caused by local structural discontinuities, thereby optimizing input matching and improving radiation efficiency.

[0076] As an alternative implementation, all components of the dual-mode broadband base station antenna are integrated using a single-sided etching process.

[0077] Understandably, single-sided PCB etching simultaneously forms radiating patches, microstrip lines, and metal ground planes on the same plane, avoiding the complex processes of interlayer alignment and via connections between multilayer substrates. Single-sided etching employs standard photolithography and chemical etching techniques to form the required metal patterns on the upper and lower surfaces of the dielectric substrate. All functional components are completed in the same manufacturing process, eliminating the need for additional assembly steps or three-dimensional structural processing, thus simplifying the manufacturing process.

[0078] Understandably, single-sided PCB etching reduces antenna manufacturing costs and process complexity by eliminating the need for expensive multilayer substrate materials and complex lamination processes, thus avoiding costly steps such as via drilling, filling, and electroplating. Simultaneously, single-sided etching offers high process consistency and yield, making it suitable for large-scale mass production and improving product reliability and repeatability. Furthermore, planar integration design reduces assembly errors and poor contact issues, enhancing the antenna's long-term stability and environmental adaptability, providing a cost-effective solution for large-scale deployment of base station antennas.

[0079] As an optional implementation method, see [link to implementation details]. Figure 2 This application provides an embodiment operating at 2.4 GHz. The dimensions of this embodiment are designed as follows: l = 31 mm, w = 30 mm, a1 = 12.25 mm, a2 = 6.5 mm, a3 = 2.3 mm, b1 = 22 mm, b2 = 0.9 mm, c1 = 5.8 mm, c2 = 33.6 mm, c3 = 0.8 mm, g = 11.5 mm.

[0080] Figure 5 This is a radiation pattern of a dual-mode broadband base station antenna at the center frequency according to an embodiment of this application.

[0081] It should be noted that the electromagnetic simulation results are available in [reference needed]. Figures 3 to 5 It achieves effective miniaturization: at the center operating frequency of 2.4 GHz, the physical size of the antenna is reduced by about 35% compared to the traditional square patch antenna; significantly widens the bandwidth: the impedance bandwidth (S11 < -10 dB) reaches 140 MHz (2.33-2.47 GHz), covering the expected operating frequency band, with a relative bandwidth of about 5.8%; has stable radiation performance: the gain in the passband is between 6.55-7.15 dBi, and the radiation pattern is stable; and has excellent frequency selectivity: a radiation null point is generated outside the high-frequency band (2.49 GHz), effectively suppressing out-of-band interference.

[0082] This application provides a dual-mode broadband base station antenna, including a dielectric substrate, a metal ground plane, a radiating patch, and two microstrip lines. The metal ground plane is disposed on one surface of the dielectric substrate, and the radiating patch and microstrip lines are disposed on the other surface of the dielectric substrate opposite to the metal ground plane. The radiating patch is etched with a slotted structure, including two U-shaped slots and one straight slot. The openings of the two U-shaped slots are opposite each other and symmetrically arranged with respect to the centerline of the radiating patch. The straight slot is perpendicular to the centerline of the radiating patch, and its two ends are respectively embedded in the openings of the two U-shaped slots. The two microstrip lines are symmetrically arranged on both sides of the radiating patch. This solves the problems of size and performance contradictions, insufficient bandwidth expansion capability, weak anti-interference capability, complex structure, and high cost in existing antenna technologies.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A dual-mode wideband base station antenna, characterized by, It includes a dielectric substrate, a metal ground plane, a radiating patch, and two microstrip lines; the metal ground plane is disposed on one side surface of the dielectric substrate, and the radiating patch and the microstrip lines are disposed on the other side surface of the dielectric substrate opposite to the metal ground plane; The radiating patch is etched with a grooved structure, which includes two U-shaped grooves and one straight groove. The openings of the two U-shaped grooves are opposite each other and symmetrically arranged with respect to the centerline of the radiating patch. The straight groove is perpendicular to the centerline of the radiating patch, and the two ends of the straight groove are respectively embedded in the openings of the two U-shaped grooves. The two microstrip lines are symmetrically arranged on both sides of the radiating patch.

2. The dual-mode broadband base station antenna according to claim 1, characterized in that, Both microstrip lines have a U-shaped structure, with the opening of the microstrip line facing the radiating patch and a gap between them, so that the microstrip line and the radiating patch can form a dual-mode resonance through electromagnetic coupling.

3. The dual-mode broadband base station antenna according to claim 2, characterized in that, The length of the microstrip line is approximately half the wavelength of the center frequency.

4. The dual-mode broadband base station antenna according to claim 2, characterized in that, The radiation from the microstrip line and the radiating patch cancels each other out in the far field, forming a radiation null point.

5. The dual-mode broadband base station antenna according to any one of claims 1-4, characterized in that, The dielectric substrate is square, the radiating patch is square, and the four edges of the radiating patch are parallel to the four edges of the dielectric substrate. The middle section of the microstrip line is parallel to one side edge of the radiating patch, and both ends of the microstrip line extend toward the radiating patch and are at least partially opposite to the two sides adjacent to the one side edge of the radiating patch.

6. The dual-mode broadband base station antenna according to claim 5, characterized in that, The depth direction of the U-shaped groove is consistent with the extension direction of the straight groove, and the extension direction of the straight groove is perpendicular to the middle section of the microstrip line.

7. The dual-mode broadband base station antenna according to any one of claims 1-4, characterized in that, The depth of the U-shaped groove is greater than or equal to the width of the U-shaped groove.

8. The dual-mode broadband base station antenna according to claim 7, characterized in that, The ratio of the width to the depth of the U-shaped groove can be flexibly set according to design requirements.

9. The dual-mode broadband base station antenna according to any one of claims 1-4, characterized in that, It also includes a coaxial feed probe, which is disposed on the side of the slotted structure and located on the centerline of the radiating patch. The coaxial feed probe is used to excite the radiating patch.

10. The dual-mode broadband base station antenna according to claim 1, characterized in that, All components are integrated using a single-sided etching process.

Images